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Whole numbers

on Sep 30, 2010

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Whole numbersPresentation Transcript

• Understanding Whole Numbers Lesson 1-1
• Vocabulary standard form – a number is written using digits and place value (the regular way to write numbers). expanded form – a number is written as a sum using the place and value of each digit.
• Place Value Chart
• How To Read a Large Number
• Numbers are grouped in sets of three (each set is called a period).
• Only read three numbers at a time.
• Say the name of the period that the numbers are in.
• Say “and” for the decimal, but do not say “and” if there isn’t a decimal.
• Example 4 , 658 , 089 Millions period Thousands period Ones period Four million, six hundred fifty-eight thousand, eighty-nine .
• Number Lines Numbers towards the right on a number line are larger. As you move to the left on a number line, the numbers get smaller. What’s Bigger? 1 or -2? 1 is larger because it is to the right of the -2. What numbers are smaller than -2? -3 and -4 are both smaller than -2 because they are to the left of -2.
• Comparing Numbers
• Line up the numbers vertically (up and down) by the ones place (or the decimal, if there is one).
• Start at the left and compare the digits.
• Move towards the right until you find a difference.
• Just a Reminder… < means “less than.” > means “greater than.” = means “equal to.”
• Example 45,312 45,321 45,312 45,321 1 is less than 2 <
• Example 2 – Put the numbers in order from least to greatest. 321; 345; 354; 29; 1,013; 312; 332 321 345 354 29 1013 312 332 largest smallest 29 1,013 312 321 332 345 354 < < < < <
• Homework Time
• Commonly Misspelled Numbers:
• hundred
• thousand
• eight
• forty
• ninety